If you're trying to render an image of 800 × 600 pixels and you do the prepass with just 200 × 150 pixels, then you'll see fewer details there and you can't place the sampling points as exactly.
Source: wiktionary
Prepass
Synonyms for "prepass"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.